Spoilers from the Civil War comics and possible spoilers for the film follow!

The 2006 Civil War crossover event was highly critically acclaimed, with several large caveats. Many critics and fans have noted that Civil War started off as a relatively even-keeled conflict between Captain America's idealistic prioritization of individual freedoms and Iron Man's perfectly reasonable contention that, after several large-scale tragedies, the superheroes' power should be regulated in some way. But by the end of the series, Tony had gone off the rails a little bit into full-on fascism, which undercut the evenhandedness and made him essentially the villain of the piece. According to Kevin Feige, the movie has made several huge changes from the comics, and as a result, he expects audiences to be pretty evenly split between Team Cap and Team Iron Man.

"Certainly if you did a poll from the comics, 90 percent of people would side with Cap. And we didn't want that. We wanted it to be…we wanted people to be torn," Feige told EW. "We wanted people to walk out of the theatre and the argument to be in the parking lot. 'No, I think Cap was right.' 'No, I think Iron Man was right.'"

According to Feige, the film succeeded in making Tony a foil to Captain America rather than a villain, as test audiences were indeed torn between the two heroes:

"We found that balance. I think in the last screening we did it was almost exactly 50/50," Feige said. "'How many of you side, agree with Cap?' Half the audience. 'How many agree with Tony?' Half the audience."

Fans of the comics can probably already guess which controversial act of Tony's was taken out of the movie: the decision to build a prison that would house unregistered heroes indefinitely (so in other words, Marvel's own version of Guantanamo Bay). But co-writer Christopher Markus came right out and confirmed it:

"If it wasn't nearly 50/50 in terms of arguability, there'd be no point in doing it," said Markus. "In some ways, I feel the comic tipped too far - because Tony just kind of lost his mind in the comic, built that space prison and all this stuff. God knows, I love Captain America. We love rebels on film, but I don't really want superpowered people just doing whatever the hell they feel like, you know? I'm all for regulation in real life. So it's an interesting sort of dilemma."

Markus went onto say that the film will make it clear where Tony is coming from, and where many Marvel films don't "dwell on" the collateral damage in the third act, Civil War will do it for them.

"There's a difference between a disaster movie or a monster movie and a hero movie because, if people are dying in a superhero movie, that on some level means the superhero isn't doing their jobs," Markus said. "Aliens can kill everyone and your heroes are still your heroes, but you've got to turn the camera away when the helicarrier crashes into the freeway in the middle of Washington, D.C. as it did in [Winter Soldier] and go, 'Did everybody just jump out of their car and run away, and Tony just paid their insurance bills, or something?'

"They saved a lot of people in Avengers: Age of Ultron, but they also dropped a city," he continued. "I mean, they didn't do it, but they were part and parcel of it. Think they got every last farmer wandering around? No. There are dead people."

And finally, Markus revealed that the inciting incident that leads to the Sokovia Accords will be caused by the new Avengers team, but "especially Scarlet Witch", who makes "an innocent mistake – which takes a lot of innocent lives."

"It is a situation where, did the participation of the Avengers in that incident make it better or worse?" Markus said. "And it's honestly debatable, where it's like, 'Okay, that's your fault. Something bad may have happened if you weren't here, but that… You did that.'"